text: // Copyright (c) 2016-2017, ZEON, (forked from) The Monero Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  // 
  // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
  
  #pragma once
  
  #include <array>
  #include <cstdint>
  #include <istream>
  #include <limits>
  #include <ostream>
  #include <string>
  #include <system_error>
  #include <vector>
  
  namespace CryptoNote {
  
  typedef size_t TransactionId;
  typedef size_t TransferId;
  typedef std::array<uint8_t, 32> TransacitonHash;
  
  struct Transfer {
    std::string address;
    int64_t amount;
  };
  
  const TransactionId INVALID_TRANSACTION_ID    = std::numeric_limits<TransactionId>::max();
  const TransferId INVALID_TRANSFER_ID          = std::numeric_limits<TransferId>::max();
  const uint64_t UNCONFIRMED_TRANSACTION_HEIGHT = std::numeric_limits<uint64_t>::max();
  
  struct Transaction {
    TransferId      firstTransferId;
    size_t          transferCount;
    int64_t         totalAmount;
    uint64_t        fee;
    TransacitonHash hash;
    bool            isCoinbase;
    uint64_t        blockHeight;
    uint64_t        timestamp;
    std::string     extra;
  };
  
  class IWalletObserver {
  public:
    virtual void initCompleted(std::error_code result) {}
    virtual void saveCompleted(std::error_code result) {}
    virtual void synchronizationProgressUpdated(uint64_t current, uint64_t total) {}
    virtual void actualBalanceUpdated(uint64_t actualBalance) {}
    virtual void pendingBalanceUpdated(uint64_t pendingBalance) {}
    virtual void externalTransactionCreated(TransactionId transactionId) {}
    virtual void sendTransactionCompleted(TransactionId transactionId, std::error_code result) {}
    virtual void transactionUpdated(TransactionId transactionId) {}
  };
  
  class IWallet {
  public:
    virtual ~IWallet() = 0;
    virtual void addObserver(IWalletObserver* observer) = 0;
    virtual void removeObserver(IWalletObserver* observer) = 0;
  
    virtual void initAndGenerate(const std::string& password) = 0;
    virtual void initAndLoad(std::istream& source, const std::string& password) = 0;
    virtual void shutdown() = 0;
  
    virtual void save(std::ostream& destination, bool saveDetailed = true, bool saveCache = true) = 0;
  
    virtual std::error_code changePassword(const std::string& oldPassword, const std::string& newPassword) = 0;
  
    virtual std::string getAddress() = 0;
  
    virtual uint64_t actualBalance() = 0;
    virtual uint64_t pendingBalance() = 0;
  
    virtual size_t getTransactionCount() = 0;
    virtual size_t getTransferCount() = 0;
  
    virtual TransactionId findTransactionByTransferId(TransferId transferId) = 0;
    
    virtual bool getTransaction(TransactionId transactionId, Transaction& transaction) = 0;
    virtual bool getTransfer(TransferId transferId, Transfer& transfer) = 0;
  
    virtual TransactionId sendTransaction(const Transfer& transfer, uint64_t fee, const std::string& extra = "", uint64_t mixIn = 0, uint64_t unlockTimestamp = 0) = 0;
    virtual TransactionId sendTransaction(const std::vector<Transfer>& transfers, uint64_t fee, const std::string& extra = "", uint64_t mixIn = 0, uint64_t unlockTimestamp = 0) = 0;
    virtual std::error_code cancelTransaction(size_t transferId) = 0;
  };
  
  }
  